G01N 21/412
Index profiling of optical fibres
Official title: {Index profiling of optical fibres}
G01N21/412 (Index profiling of optical fibres) appears on 90 US grants and 69 published applications in this corpus.
Search patents in G01N- Granted patents
- 90
- Published applications
- 69
- Assignees
- 60
- Inventors
- 172
- Latest grant
- 24 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 3 | 0 |
| 1993 | 0 | 0 |
| 1994 | 6 | 0 |
| 1995 | 3 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 1 |
| 2002 | 0 | 2 |
| 2003 | 1 | 2 |
| 2004 | 1 | 4 |
| 2005 | 5 | 3 |
| 2006 | 4 | 0 |
| 2007 | 0 | 0 |
| 2008 | 1 | 1 |
| 2009 | 0 | 1 |
| 2010 | 0 | 1 |
| 2011 | 1 | 3 |
| 2012 | 1 | 1 |
| 2013 | 3 | 1 |
| 2014 | 2 | 3 |
| 2015 | 0 | 0 |
| 2016 | 2 | 2 |
| 2017 | 0 | 2 |
| 2018 | 2 | 8 |
| 2019 | 5 | 17 |
| 2020 | 7 | 5 |
| 2021 | 3 | 3 |
| 2022 | 6 | 3 |
| 2023 | 4 | 1 |
| 2024 | 3 | 2 |
| 2025 | 2 | 1 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Ultra low-na refractive index profiling system and method for filtering out severely disturbing diffraction effects24 Feb 2026US 12,560,537 B2Heraeus Quartz North America LLC
- Tomographic refractive index profile evaluation of non-symmetrical glass fiber preforms and fibers themselves23 Sep 2025US 12,422,359 B2Heraeus Quartz North America LLC
- Methods and apparatuses for monitoring the curing of a photocurable material1 Apr 2025US 12,265,075 B2Corning Incorporated
- Method and device for controlling a production system for planar or strand-shaped bodies3 Dec 2024US 12,157,263 B2Sikora AG
- Method for determining the refractive-index profile of a cylindrical optical object10 Sep 2024US 12,085,506 B2Heraeus Quarzglas GmbH & Co.KG
- Optical fiber characteristic measurement system and humidity measurement method9 Apr 2026US 2026/0098805 A1Yokogawa Electric Corporation
- Optical fiber preform, method for measuring refractive index profile of optical fiber preform, and method for producing optical fiber preform29 Jan 2026US 2026/0029342 A1Fujikura Ltd.
- Ammonia gas sensor based on small-period longperiod fiber grating10 Jul 2025US 2025/0224387 A1Huazhong University of Science and Technology
- Tomographic refractive index profile evaluation of non-symmetrical glass fiber preforms and fibers themselves26 Dec 2024US 2024/0426750 A1Heraeus Quartz North America LLC
- Ultra low-na refractive index profiling system and method for filtering out severely disturbing diffraction effects7 Nov 2024US 2024/0369479 A1Heraeus Quartz North America LLC
Most cited
By later US patents
- Systems and methods for measuring a profile characteristic of a glass sample187US 8,854,623 B2Corning Incorporated · 2014
- Optical fibre means39US 7,088,437 B2Optoskand AB · 2006
- Method and apparatus for measuring optical constants of a thin film as well as method and apparatus for fabricating a thin film utilizing same35US 5,125,740 AHitachi, Ltd. · 1992
- Methods for non-destructively determining parameters of an optical fiber preform26US 4,227,806 AWestern Electric Company, Inc. · 1980
- Method of measuring the refractive index profile and the core diameter of optical fibers and preforms24US 4,362,943 ABell Telephone Laboratories, Incorporated · 1982